/*
 * Copyright 2004 original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.extremecomponents.table.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.extremecomponents.table.tag.TableItemsTag;
import org.extremecomponents.util.XmlUtils;

/**
 * @author Eccn-sshwsfc
 * ajax filter only disable another input get response's writer
 */
public class TableAjaxFilter implements Filter {

    private FilterConfig filterConfig;

    public void init(FilterConfig filterConfig) throws ServletException {
        this.filterConfig = filterConfig;
    }

    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {

        if (!isAjaxRequest(servletRequest)) {
            filterChain.doFilter(servletRequest, servletResponse);
            return;
        }

        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        BufferResponseWrapper bufferResponseWrapper = new BufferResponseWrapper(response);

        try {
            filterChain.doFilter(request, bufferResponseWrapper);
        }

        catch (Throwable e) {
            XmlUtils.handleError(response, e);
        }

    }


    private boolean isAjaxRequest(ServletRequest servletRequest) {
        HttpServletRequest request = (HttpServletRequest)servletRequest;
        return Boolean.TRUE.toString().equals(request.getHeader(TableItemsTag.AJAX_PARAMETER));
	}

	public void destroy() {
        filterConfig = null;
    }
}